Merge pull request #55 from tkorvola/undo
authorDavid Griffith <dave@661.org>
Wed, 24 Jan 2018 20:59:07 +0000 (12:59 -0800)
committerGitHub <noreply@github.com>
Wed, 24 Jan 2018 20:59:07 +0000 (12:59 -0800)
Fix SEGV on undo past beginning of game.


Trivial merge